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试样以氢氧化钠熔融,用水提取,盐酸脱水后重量法测定硅。分取部分滤液,在三乙醇胺存在下,以氢氧化钠沉淀稀土和镁,并加入少量 EDTA 及过氧化氢使钛、钙保留于溶液中,达到分离的目的。沉淀以盐酸溶解,分别以差示比色法测定稀土,以络量法测定镁。操作方法:称取试样0.2克置于预先熔融过4克氢氧化钠的铁坩埚中,再复盖氢氧化钠2克,加盖,先在电炉上低
The sample was melted with sodium hydroxide, extracted with water, dehydrated hydrochloric acid after gravimetric determination of silicon. Take part of the filtrate, in the presence of triethanolamine, rare earth and magnesium precipitation with sodium hydroxide, and add a small amount of EDTA and hydrogen peroxide so that titanium and calcium remain in solution for the purpose of separation. The precipitate was dissolved with hydrochloric acid, respectively, by differential colorimetric determination of rare earth, determination of magnesium by volume method. Method of operation: Weigh 0.2 g sample was placed in a pre-melted iron 4 grams of sodium hydroxide crucible, and then covered with sodium hydroxide 2 grams, stamped, first low on the electric stove